I could be wrong but I did work out the contribution of Rhenium to the overall project.
Based on the mentioned price of US$4700/ lb for Rhenium, each gram of Rhenium will contribute about US$11/tonne.
At 1.6g/tonne, we are looking at US$17.60/tonne for the whole project.
For ease of working, the total tonnage is approx.50M tonne and hence the insitu value of Rhenium is about US$880m.